JP2006275242A - Constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant velocity universal joint improved in service life of a boot by enabling circulation of a gas between inside and outside the boot in the condition wherein circulation of the liquid is stopped. <P>SOLUTION: A seal structure 64, which allows a gas to pass through but does not allow a liquid and a solid to pass through, is provided outside an inside joint member 20, which is arranged inside the outside joint member 10, in the axial direction of the outside joint member 10. The seal structure 64 has a plurality of wall parts 64a and 64b arranged with the predetermined interval in the axial direction of the outside joint member 10, and each of the wall parts 64a and 64b is formed with ventilation holes 64a1 and 64b1. Each of the ventilation holes 64a1 and 64b1 is formed at a different position with a view from the axial direction of the outside joint member 10, and a gas flow path A is assembled. With this structure, a pressure difference between inside and outside the joint is relaxed, and excessive deformation of the boot 51 is restricted to improve service life thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、例えば自動車のプロペラシャフトやドライブシャフト、或いは各種産業機械に用いられる等速自在継手に関するものである。   The present invention relates to a constant velocity universal joint used in, for example, a propeller shaft and a drive shaft of an automobile or various industrial machines.

自動車のプロペラシャフトやドライブシャフトに使用される摺動式等速自在継手の一種に、図５に示すクロスグルーブ型と称されるものがある。この等速自在継手は、外側継手部材１０、内側継手部材２０、複数個（例えば６個）のボール３０（転動体）、保持器４０、アダプタ付きブーツ５０及びエンドキャップ６０を主要な構成要素として備える（例えば特許文献１参照）。なお、図５では、便宜上、外側継手部材１０の回転中心Ｏの上側にボール３０の中心を通る断面を示し、回転中心Ｏの下側にボール３０相互間の中央部を通る断面を示している。このため、図では、外側継手部材１０の内部形状や内側継手部材２０の外部形状、エンドキャップ６０の断面形状等が回転中心Ｏに関して非対称になっているが、実際には、本発明の実施形態を示す図１のように、回転中心Ｏに関して対称性を有する。   One type of slidable constant velocity universal joint used for propeller shafts and drive shafts of automobiles is a so-called cross groove type shown in FIG. The constant velocity universal joint includes an outer joint member 10, an inner joint member 20, a plurality of (for example, six) balls 30 (rolling elements), a cage 40, a boot 50 with an adapter, and an end cap 60 as main components. Provided (see, for example, Patent Document 1). In FIG. 5, for the sake of convenience, a cross section passing through the center of the ball 30 is shown above the rotation center O of the outer joint member 10, and a cross section passing through the central portion between the balls 30 is shown below the rotation center O. . For this reason, in the figure, the internal shape of the outer joint member 10, the external shape of the inner joint member 20, the cross-sectional shape of the end cap 60, and the like are asymmetric with respect to the rotation center O. 1 having symmetry with respect to the rotation center O.

外側継手部材１０は、円筒状に形成され、内周面に複数のトラック溝１１を有する。外側継手部材１０の環状端面には、トラック溝１１の相互間に対応する位置にそれぞれボルト孔１２を形成してある。内側継手部材２０は、外側継手部材１０のトラック溝１１と対になる複数のトラック溝２１を外周面に形成してある。内側継手部材２０の内周側には、スタブシャフト２３をトルク伝達可能に嵌合してある。スタブシャフト２３は、その先端に形成された輪溝２４にスナップリングまたはサークリップ２５を装着することで、内側継手部材２０の軸方向に位置決め固定される。外側継手部材１０のトラック溝１１と内側継手部材２０のトラック溝２１は、その相互間でボール３０を一個ずつ配置するための空間（ボールトラック）を形成する。外側継手部材１０のトラック溝１１と内側継手部材２０のトラック溝２１は、それぞれ周方向逆向きに傾けて形成され、互いに交差している。これにより外側継手部材１０と内側継手部材２０の軸方向相対移動が許容される。保持器４０は、外側継手部材１０と内側継手部材２０の間に配置され、周方向に所定間隔で複数形成したポケット４１でボール３０を一個ずつ保持する。   The outer joint member 10 is formed in a cylindrical shape and has a plurality of track grooves 11 on the inner peripheral surface. Bolt holes 12 are formed on the annular end surface of the outer joint member 10 at positions corresponding to each other between the track grooves 11. The inner joint member 20 has a plurality of track grooves 21 which are paired with the track grooves 11 of the outer joint member 10 formed on the outer peripheral surface. A stub shaft 23 is fitted on the inner peripheral side of the inner joint member 20 so that torque can be transmitted. The stub shaft 23 is positioned and fixed in the axial direction of the inner joint member 20 by attaching a snap ring or circlip 25 to a ring groove 24 formed at the tip of the stub shaft 23. The track groove 11 of the outer joint member 10 and the track groove 21 of the inner joint member 20 form a space (ball track) for arranging the balls 30 one by one. The track groove 11 of the outer joint member 10 and the track groove 21 of the inner joint member 20 are formed to be inclined in opposite directions in the circumferential direction and intersect each other. Thereby, the axial direction relative movement of the outer joint member 10 and the inner joint member 20 is permitted. The cage 40 is disposed between the outer joint member 10 and the inner joint member 20 and holds the balls 30 one by one in a plurality of pockets 41 formed at predetermined intervals in the circumferential direction.

一方、上記の等速自在継手は、外側継手部材１０及び内側継手部材２０とボール３０との間の摩擦抵抗を軽減するために、継手内部に潤滑剤が充填される。この潤滑剤が継手外部に漏れたり、外部から泥水や砂塵等の異物が侵入したりすると、前記摩擦抵抗が高くなり継手性能が低下する。このため、外側継手部材１０の内側端部及びスタブシャフト２３のそれぞれに気密に嵌合させたアダプタ付きブーツ５０と、外側継手部材１０の他端部に取付けたエンドキャップ６０とで継手内部を密封してある。   On the other hand, in the above constant velocity universal joint, in order to reduce the frictional resistance between the outer joint member 10 and the inner joint member 20 and the ball 30, the inside of the joint is filled with a lubricant. If this lubricant leaks to the outside of the joint, or if foreign matter such as muddy water or sand dust enters from the outside, the frictional resistance increases and joint performance deteriorates. For this reason, the inside of the joint is hermetically sealed by the boot 50 with an adapter that is airtightly fitted to the inner end of the outer joint member 10 and each of the stub shafts 23 and the end cap 60 that is attached to the other end of the outer joint member 10. It is.

アダプタ付きブーツ５０は、ゴム材又は可撓性樹脂材からなるブーツ５１と金属製のアダプタ５２とからなる。ブーツ５１は、スタブシャフト２３に外嵌する小径端部５１ａとアダプタ５２に接続される大径端部５１ｂの間に蛇腹形状の屈曲部５１ｃを設けてある。ブーツ５１の小径端部５１ａは、バンド５３によって締付けられ、スタブシャフト２３に対して固着される。アダプタ５２は、ブーツ５１の大径端部５１ｂに加締め固定される加締め部５２ａと、外側継手部材１０に嵌合させる環状フランジ５２ｂとを有する。アダプタ５２の環状フランジ５２ｂは、外側継手部材１０のボルト孔１２と対応するボルト孔５２ｃを複数有する。なお、蛇腹状のブーツ５１はアダプタ５２を介さずに外側継手部材１０に対して直接装着することもある。また、ブーツ５１の屈曲部５１ｃの形状は上記蛇腹形状に限定されない。例えば本発明の実施形態を示す図１のように、屈曲部５１ｃの形状を断面Ｕ字形状としたものもある。   The boot 50 with an adapter includes a boot 51 made of a rubber material or a flexible resin material and a metal adapter 52. The boot 51 is provided with a bellows-shaped bent portion 51 c between a small-diameter end portion 51 a that is externally fitted to the stub shaft 23 and a large-diameter end portion 51 b that is connected to the adapter 52. A small-diameter end 51 a of the boot 51 is fastened by a band 53 and fixed to the stub shaft 23. The adapter 52 includes a caulking portion 52 a that is caulked and fixed to the large-diameter end portion 51 b of the boot 51, and an annular flange 52 b that is fitted to the outer joint member 10. The annular flange 52 b of the adapter 52 has a plurality of bolt holes 52 c corresponding to the bolt holes 12 of the outer joint member 10. The bellows-shaped boot 51 may be directly attached to the outer joint member 10 without using the adapter 52. Further, the shape of the bent portion 51c of the boot 51 is not limited to the bellows shape. For example, as shown in FIG. 1 showing the embodiment of the present invention, there is a bent portion 51c having a U-shaped cross section.

エンドキャップ６０は、外側継手部材１０の他端開口を閉塞するカップ部６１と、カップ部６１の周縁部に設けられ、外側継手部材１０の他端部に外嵌させる環状フランジ６２とを有する。エンドキャップ６０の環状フランジ６２は、外側継手部材１０のボルト孔１２と対応するボルト孔６３を複数有する。   The end cap 60 includes a cup portion 61 that closes the other end opening of the outer joint member 10, and an annular flange 62 that is provided on the peripheral edge of the cup portion 61 and is fitted on the other end portion of the outer joint member 10. The annular flange 62 of the end cap 60 has a plurality of bolt holes 63 corresponding to the bolt holes 12 of the outer joint member 10.

上記の等速自在継手は、外側継手部材１０の両端部にそれぞれアダプタ５２及びエンドキャップ６０を嵌合させ、ボルト７１を、アダプタ５２、外側継手部材１０、エンドキャップ６０、および、スタブシャフト７０の各ボルト孔５２ｃ，１２，６３，７２に挿し通し、スタブシャフト７０側からナット７３で締付けて一体化される一方、シャフト２２の図示しない他端を図示外のシャフト又は継手にトルク伝達可能に連結することで、プロペラシャフト等に組込まれる。   In the constant velocity universal joint, the adapter 52 and the end cap 60 are fitted to both ends of the outer joint member 10, and the bolt 71 is connected to the adapter 52, the outer joint member 10, the end cap 60, and the stub shaft 70. The bolts 52c, 12, 63 and 72 are inserted into the bolt holes 52 and integrated by tightening with nuts 73 from the stub shaft 70 side, while the other end (not shown) of the shaft 22 is connected to a shaft or joint (not shown) so that torque can be transmitted. By doing so, it is incorporated into a propeller shaft or the like.

上記の等速自在継手を自動車のプロペラシャフトに使用した場合、外側継手部材１０と内側継手部材２０の軸方向角度変位（作動角）が小さく高速回転下で使用されることが多い。このような等速自在継手においては、高速回転時に継手内部の温度上昇に伴って内圧が上昇する一方、その後に冷却されて負圧になるなどして内圧が変動する。継手の内圧変化によりブーツ５１が過大に変形すると、ブーツ５１の耐久性が低下する。   When the above constant velocity universal joint is used for a propeller shaft of an automobile, the axial angular displacement (operation angle) of the outer joint member 10 and the inner joint member 20 is often small and used under high speed rotation. In such a constant velocity universal joint, the internal pressure rises as the temperature inside the joint rises during high-speed rotation, while the internal pressure fluctuates due to subsequent cooling to negative pressure. If the boot 51 is deformed excessively due to a change in the internal pressure of the joint, the durability of the boot 51 is lowered.

なお、上記のクロスグルーブ型等速自在継手は、外側継手部材１０と内側継手部材２０が軸方向に相対移動する摺動式であるが、他の摺動式等速自在継手（例えばトリポード型）や、外側継手部材１０と内側継手部材２０が軸方向に相対移動しない固定式等速自在継手においても、内圧変化によるブーツの変形は共通した現象である。但し、摺動式の場合は、外側継手部材１０と内側継手部材２０の軸方向相対移動で内部容積が変化することによっても内圧が変化するので、固定式に比べてブーツ５１の耐久性が低下しやすい。   The cross groove type constant velocity universal joint described above is a sliding type in which the outer joint member 10 and the inner joint member 20 are relatively moved in the axial direction, but other sliding type constant velocity universal joints (for example, tripod type). Even in the fixed type constant velocity universal joint in which the outer joint member 10 and the inner joint member 20 do not move relative to each other in the axial direction, the deformation of the boot due to the change in internal pressure is a common phenomenon. However, in the case of the sliding type, since the internal pressure also changes due to the change in the internal volume due to the relative movement of the outer joint member 10 and the inner joint member 20 in the axial direction, the durability of the boot 51 is reduced compared to the fixed type. It's easy to do.

継手の内圧変化によるブーツ５１の過大変形に関する問題を解決するために、図６及び図７のように、ブーツ５１の小径端部５１ａの内径側に通気溝５１ｄを設けると共に、小径端部５１ａからスタブシャフト２３に接触させるリップ部５１ｅを延設し、リップ部５１ｅの内径側に突起５１ｆを不連続的に複数形成したものがある。内圧上昇時には、リップ部５１ｅが外側に開放され、通気溝５１ｄを介して継手内外を連通させる。負圧時には、突起５１ｆを境にしてリップ部５１ｅの基端側が内側に吸引される一方、リップ部５１ｅの先端側がスタブシャフト２３から離れ、突起５１ｆ間の隙間から外気が流入する。このような継手内外の空気の流出入作用（以下、呼吸作用という。）により、継手内外の圧力差が低減するから、ブーツ５１の過大な変形が抑制され、ブーツの長寿命化が図られる。なお、特許文献２には、図６及び図７に示すブーツ５１の通気構造が開示されている。   In order to solve the problem relating to the excessive deformation of the boot 51 due to the change in the internal pressure of the joint, as shown in FIGS. 6 and 7, a ventilation groove 51d is provided on the inner diameter side of the small diameter end portion 51a of the boot 51, and from the small diameter end portion 51a. Some lip portions 51e are brought into contact with the stub shaft 23, and a plurality of discontinuous protrusions 51f are formed on the inner diameter side of the lip portion 51e. When the internal pressure rises, the lip portion 51e is opened to the outside, and the inside and outside of the joint are communicated via the ventilation groove 51d. At the time of negative pressure, the base end side of the lip portion 51e is sucked inward from the projection 51f as a boundary, while the distal end side of the lip portion 51e is separated from the stub shaft 23, and the outside air flows from the gap between the projections 51f. By such an inflow / outflow action of the air inside and outside the joint (hereinafter referred to as a breathing action), the pressure difference between the inside and outside of the joint is reduced, so that excessive deformation of the boot 51 is suppressed, and the life of the boot is extended. Patent Document 2 discloses a ventilation structure for the boot 51 shown in FIGS. 6 and 7.

特開２００３−０７４５８０号公報JP 2003-074580 A 特開平８−２８７０４号公報JP-A-8-28704

特許文献１の場合、ブーツ５１の過大変形はある程度緩和されるものの、ブーツ５１をゴム材又は可撓性樹脂材で構成している以上、リップ部５１ｅの劣化や破損によるシール作用の早期低下は避けられない。リップ部５１ｅは肉薄に形成することで開閉動作が可能になっているが、肉薄であるが故に、前記開閉動作の支点となるリップ部５１ｅの基端部や突起５１ｆの基端部などに割れが生じやすい。リップ部５１ｅの割れにより、スタブシャフト２３に対するリップ部５１ｅの密着性が低下すると、潤滑剤漏れや異物侵入を防止するというブーツ本来のシール作用が損なわれ、却ってブーツ５１の寿命を低下させることも懸念される。   In the case of Patent Document 1, although the excessive deformation of the boot 51 is alleviated to some extent, as long as the boot 51 is made of a rubber material or a flexible resin material, an early decrease in the sealing action due to deterioration or breakage of the lip 51e can be prevented. Inevitable. The lip portion 51e can be opened and closed by being thin. However, since the lip portion 51e is thin, the lip portion 51e is cracked at the proximal end portion of the lip portion 51e or the proximal end portion of the protrusion 51f that serves as a fulcrum for the opening and closing operation. Is likely to occur. If the adhesiveness of the lip 51e to the stub shaft 23 is reduced due to the crack of the lip 51e, the original sealing action of the boot that prevents lubricant leakage and foreign matter intrusion is impaired, and instead the life of the boot 51 may be reduced. Concerned.

本発明は、斯かる実情に鑑み創案されたものであって、その目的は、潤滑剤漏れや異物侵入を防止するためのシール作用と、ブーツの過大変形を抑制するための呼吸作用とを長期に渡って維持できる等速自在継手を提供することにある。   The present invention has been devised in view of such circumstances, and its purpose is to provide a sealing action for preventing lubricant leakage and entry of foreign matter and a breathing action for suppressing excessive deformation of the boot for a long time. An object of the present invention is to provide a constant velocity universal joint that can be maintained over a wide range.

本発明に係る等速自在継手は、軸方向両端が開口した外側継手部材と、外側継手部材に対して相対的に揺動自在に配設された内側継手部材と、外側継手部材と内側継手部材との間にあって内側継手部材の揺動を許容しつつ外側継手部材及び内側継手部材間のトルク伝達を行なう複数の転動体と、内側継手部材に対してトルク伝達可能に結合され、外側継手部材の軸方向内側端部から外部へ延在させたシャフトと、外側継手部材の軸方向内側端部とシャフトに装着され、外側継手部材の軸方向内端側を閉塞するブーツと、外側継手部材の軸方向外端側に設けたシール構体とを備えた等速自在継手において、シール構体が外側継手部材の軸方向に所定間隔で配設される複数の壁部を有し、各壁部に通気孔を形成すると共に少なくともひとつの壁部の通気孔を他の壁部の通気孔と相違する位置に形成したことを特徴としている。   The constant velocity universal joint according to the present invention includes an outer joint member that is open at both ends in the axial direction, an inner joint member that is swingable relative to the outer joint member, an outer joint member, and an inner joint member. A plurality of rolling elements that transmit torque between the outer joint member and the inner joint member while allowing the inner joint member to swing, and are coupled to the inner joint member so as to be able to transmit torque. A shaft extending outward from the axially inner end, an axially inner end of the outer joint member, a boot attached to the shaft and closing the axially inner end of the outer joint member, and the shaft of the outer joint member In the constant velocity universal joint provided with a seal structure provided on the outer end side in the direction, the seal structure has a plurality of wall portions arranged at predetermined intervals in the axial direction of the outer joint member, and each wall portion has a vent hole. Forming and at least one wall It is characterized in that formed at a position different vents and other wall portion of the vent.

本発明の最も重要なポイントは、外側継手部材の軸方向と内側継手部材の軸方向とに角度変位をとっても弾性変形が要求されないシール構体で、呼吸作用に必要な通気性を確保した点である。シール構体は、外側継手部材の軸方向から見て、少なくともひとつの壁部の通気孔を他の壁部の通気孔とずらした位置に形成し、継手内外を結ぶ気体の流動経路を入り組ませてある。このように気体の流動経路を入り組ませると、気体の通過は許容されるが液体及び固体の通過は抑制されるので、シール構体にて所望の呼吸作用とシール作用が得られる。シール構体の呼吸作用により継手内外の圧力差が低減し、ブーツの過大な変形が避けられるので、ブーツの寿命が延びると共にそのシール作用も長期に渡って維持される。また、シール構体は、上記のリップ部５１ｅのような弾性変形で呼吸作用を奏するものではないので、リップ部５１ｅに比べて耐久性が高い。このため、シール構体の呼吸作用とシール作用も長期に渡って維持される。なお、シール構体は、壁部が変形又は劣化したとしても、液体又は固体が容易に通過できる程度の孔や割れが生じない限り、所望のシール作用及び呼吸作用が維持される。   The most important point of the present invention is a seal structure that does not require elastic deformation even if an angular displacement is taken between the axial direction of the outer joint member and the axial direction of the inner joint member, and ensures the air permeability necessary for the breathing action. . As seen from the axial direction of the outer joint member, the seal structure is formed so that at least one wall vent is shifted from the other wall vent, and the gas flow path connecting the inside and outside of the joint is not complicated. It is. When the gas flow path is complicated in this way, the passage of the gas is allowed but the passage of the liquid and the solid is suppressed, so that a desired breathing action and a sealing action can be obtained in the seal structure. The pressure difference between the inside and outside of the joint is reduced by the breathing action of the seal structure and excessive deformation of the boot is avoided, so that the life of the boot is extended and the sealing action is maintained for a long time. Further, since the seal structure does not exhibit a breathing action by elastic deformation like the lip portion 51e, the seal structure has higher durability than the lip portion 51e. For this reason, the breathing action and the sealing action of the seal structure are also maintained for a long time. In addition, even if a wall part deform | transforms or deteriorates, as long as a hole and a crack which can pass a liquid or solid easily do not arise, a desired sealing action and breathing action are maintained.

本発明に係る等速自在継手は、通気孔を有する壁部を所定間隔で配置したシール構体により、液体及び固体の通過を阻止した状態で通気性を確保したから、ブーツのシール作用を維持しつつ過大な変形を抑制してブーツの長寿命化を図ることができる。また、シール構体が変形を繰り返す構成ではないため、変形による破損がシール構体に生じない。このため、シール構体の耐久性が高く、その呼吸作用とシール作用を長期に渡って維持することができる。   In the constant velocity universal joint according to the present invention, the seal structure in which the wall portions having the air holes are arranged at predetermined intervals ensures the air permeability in a state in which the passage of liquid and solid is prevented, so that the sealing action of the boot is maintained. However, excessive deformation can be suppressed and the life of the boot can be extended. Further, since the seal structure is not configured to be repeatedly deformed, damage due to the deformation does not occur in the seal structure. For this reason, the durability of the sealing structure is high, and the breathing action and the sealing action can be maintained for a long time.

以下、添付図面を参照しつつ本発明に係る等速自在継手の一実施形態について説明する。なお、本実施形態の等速自在継手は、自動車のプロペラシャフトに使用されるものである。ただし、用途はこれに限定されるものではなく、自動車のドライブシャフトや各種産業機械にも使用できる。   Hereinafter, an embodiment of a constant velocity universal joint according to the present invention will be described with reference to the accompanying drawings. In addition, the constant velocity universal joint of this embodiment is used for the propeller shaft of a motor vehicle. However, the application is not limited to this, and it can be used for a drive shaft of an automobile and various industrial machines.

図１は、本発明に係る等速自在継手の一実施形態を示す縦断面図である。この等速自在継手は、従来例と同様に、外側継手部材１０、内側継手部材２０、複数のボール３０（転動体）、保持器４０、アダプタ付きブーツ５０及びエンドキャップ６０を主要な構成要素として備える。外側継手部材１０、内側継手部材２０、複数のボール３０、保持器４０及びアダプタ付きブーツ５０の構成は、図５に示す従来例と同じである。したがって、従来例と同一部位には同一符号を付して説明を省略する。   FIG. 1 is a longitudinal sectional view showing an embodiment of a constant velocity universal joint according to the present invention. As in the conventional example, the constant velocity universal joint includes an outer joint member 10, an inner joint member 20, a plurality of balls 30 (rolling elements), a cage 40, a boot 50 with an adapter, and an end cap 60 as main components. Prepare. The configuration of the outer joint member 10, the inner joint member 20, the plurality of balls 30, the cage 40, and the boot 50 with an adapter is the same as that of the conventional example shown in FIG. Therefore, the same parts as those in the conventional example are denoted by the same reference numerals and the description thereof is omitted.

本実施形態の等速自在継手は、エンドキャップ６０の中央部に気体の通過を許容しつつ液体や固体の通過を抑制するシール構体６４を備える。このシール構体６４は、継手外部に向かって凸形状に形成されたカップ部６１の中央部で構成される第１の壁部６４ａと、カップ部６１の内面側に溶接又は接着等により固着した円板状の第２の壁部６４ｂとからなる。第１の壁部６４ａの平板状の中央部と第２の壁部６４ｂは、外側継手部材１０の軸方向に所定間隔を隔てて配置される。第１の壁部６４ａと第２の壁部６４ｂには、それぞれ通気孔６４ａ１，６４ｂ１を１つずつ形成してある。各通気孔６４ａ１，６４ｂ１の大きさや形状は特に問わないが、わずかな空気の出入りに必要な大きさ形状（例えば直径１ｍｍ以下の円形孔）であれば十分であり、あまり大きくする必要はない。これらの通気孔６４ａ１，６４ｂ１は、外側継手部材１０の回転中心Ｏから偏心させた位置であって、外側継手部材１０の軸方向から見て相違する位置に形成してある。詳しくは、第１及び第２の壁部６４ａ，６４ｂの外周端部と外側継手部材１０の回転中心Ｏの中間部であって、回転中心Ｏ回りの角度すなわち位相が相違する位置に通気孔６４ａ１，６４ｂ１を設けてある。この実施形態では、各通気孔６４ａ１，６４ｂ１の回転中心Ｏ回りの角度を１８０度ずらしてある。   The constant velocity universal joint of this embodiment includes a seal structure 64 that suppresses the passage of liquid or solid while allowing the passage of gas at the center of the end cap 60. The seal structure 64 includes a first wall portion 64a formed at the center portion of the cup portion 61 formed in a convex shape toward the outside of the joint, and a circle fixed to the inner surface side of the cup portion 61 by welding or adhesion. It consists of a plate-like second wall portion 64b. The flat central portion of the first wall portion 64 a and the second wall portion 64 b are arranged at a predetermined interval in the axial direction of the outer joint member 10. Vent holes 64a1 and 64b1 are formed in the first wall portion 64a and the second wall portion 64b, respectively. The size and shape of each of the vent holes 64a1 and 64b1 are not particularly limited, but a size and shape necessary for entering and exiting a slight amount of air (for example, a circular hole having a diameter of 1 mm or less) is sufficient and does not need to be so large. These vent holes 64a1 and 64b1 are formed at positions that are eccentric from the rotation center O of the outer joint member 10 and are different from each other when viewed from the axial direction of the outer joint member 10. Specifically, the air holes 64a1 are located at the intermediate portions between the outer peripheral end portions of the first and second wall portions 64a and 64b and the rotation center O of the outer joint member 10 and at different angles or phases around the rotation center O. , 64b1 are provided. In this embodiment, the angles around the rotation center O of the vent holes 64a1 and 64b1 are shifted by 180 degrees.

本実施形態の等速自在継手の上記構成によれば、シール構体６４の各壁部６４ａ，６４ｂに形成した通気孔６４ａ１，６４ｂ１により、継手内外を結ぶ気体の流動経路Ａが形成される。シール構体６４は、通気孔６４ａ１，６４ｂ１の回転中心Ｏ回りの角度をずらして気体の流動経路Ａを入り組ませてあるので、空気の通過を許容しつつ潤滑剤や異物の通過を抑制することができる。詳しくは、第１の壁部６４ａの外面に付着した異物や第２の壁部６４ｂの内面に付着した潤滑剤は、等速自在継手の回転時に遠心力で各壁部６４ａ，６４ｂの外径側に偏在した状態になる。したがって、第１及び第２の壁部６４ａ，６４ｂの外周端部と回転中心Ｏの中間部に形成された通気孔６４ａ１，６４ｂ１付近では、潤滑剤や異物の付着が非常に少ない状態にすることができ、潤滑剤や異物がシール構体６４を通り抜けるのを抑制できる。万一、潤滑剤や異物が各壁部６４ａ，６４ｂの外径側に向かって移動する経路上に通気孔６４ａ１，６４ｂ１があったとしても、潤滑剤や異物に遠心力が作用しているので、通気孔６４ａ１，６４ｂ１の通り抜けを抑制できる。   According to the above-described configuration of the constant velocity universal joint of the present embodiment, the gas flow path A connecting the inside and outside of the joint is formed by the vent holes 64a1 and 64b1 formed in the respective wall portions 64a and 64b of the seal structure 64. Since the seal structure 64 has the gas flow path A complicated by shifting the angle around the rotation center O of the vent holes 64a1 and 64b1, it suppresses the passage of the lubricant and foreign matter while allowing the passage of air. Can do. Specifically, the foreign matter adhering to the outer surface of the first wall portion 64a and the lubricant adhering to the inner surface of the second wall portion 64b are caused by centrifugal force during rotation of the constant velocity universal joint, and the outer diameter of each wall portion 64a, 64b. It becomes a state that is unevenly distributed to the side. Therefore, in the vicinity of the vent holes 64a1 and 64b1 formed in the outer peripheral end portions of the first and second wall portions 64a and 64b and the intermediate portion of the rotation center O, the adhesion of the lubricant and the foreign matter should be extremely small. It is possible to suppress the lubricant and foreign matter from passing through the seal structure 64. Even if there are vent holes 64a1 and 64b1 on the path through which the lubricant and foreign matter move toward the outer diameter side of the walls 64a and 64b, the centrifugal force acts on the lubricant and foreign matter. Further, the passage of the air holes 64a1 and 64b1 can be suppressed.

なお、本実施形態の等速自在継手は、外側継手部材１０に連結したスタブシャフト７０の内部にシール構体６４を介して連通させてある。スタブシャフト７０の図示しない端部は、図示しない等速自在継手やシャフト等に連結される。スタブシャフト７０の内部は、プロペラシャフトの外部と連通していないか、或いは図示しない等速自在継手やシャフト等を介してプロペラシャフトの外部と連通する。いずれにしてもスタブシャフト７０の内部には、プロペラシャフト外部の異物が極めて侵入しにくい。このように、本実施形態の等速自在継手は、泥水や塵芥等の異物がほとんど存在しないスタブシャフト７０の内部に連通させることによっても、異物の侵入が防止される。   The constant velocity universal joint of the present embodiment is communicated with the inside of the stub shaft 70 connected to the outer joint member 10 via the seal structure 64. An end (not shown) of the stub shaft 70 is connected to a constant velocity universal joint, a shaft, etc. (not shown). The inside of the stub shaft 70 does not communicate with the outside of the propeller shaft, or communicates with the outside of the propeller shaft via a constant velocity universal joint, a shaft, or the like (not shown). In any case, foreign matter outside the propeller shaft hardly enters the stub shaft 70. As described above, the constant velocity universal joint according to the present embodiment can prevent foreign matter from entering even by communicating with the inside of the stub shaft 70 in which foreign matter such as muddy water and dust is hardly present.

一方、本実施形態の等速自在継手は、回転や停止に伴って内部温度が変化しても、継手内部とスタブシャフト７０の内部（継手外部）の間でシール構体６４を介して空気が流動するので、継手内部とスタブシャフト７０の内部の間に圧力差が生じない。このため、エンドキャップ６０は、継手の内部温度が変化しても弾性変形しないので、ブーツ５１に比べて耐久性が高く、その呼吸作用及びシール作用を長期に渡って維持することができる。なお、一般的なエンドキャップは、ブーツ５１を構成するゴム材又は可撓性樹脂材に比べて剛性の高い金属材や剛性樹脂材、或いはセラミック材などの剛性体で構成されるが、本実施形態のエンドキャップ６０は、その一部又は全部を上記剛性体に限らず、ブーツ５１と同様のゴム材や可撓性樹脂材で構成することも可能である。   On the other hand, in the constant velocity universal joint according to the present embodiment, air flows between the inside of the joint and the inside of the stub shaft 70 (outside the joint) via the seal structure 64 even when the internal temperature changes with rotation or stop. Therefore, there is no pressure difference between the inside of the joint and the inside of the stub shaft 70. For this reason, the end cap 60 is not elastically deformed even when the internal temperature of the joint changes, and therefore, the end cap 60 has higher durability than the boot 51 and can maintain its breathing action and sealing action for a long period of time. In addition, although a general end cap is comprised with rigid bodies, such as a metal material, a rigid resin material, or a ceramic material with high rigidity compared with the rubber material or flexible resin material which comprises the boot 51, this implementation A part or all of the end cap 60 is not limited to the rigid body, but may be formed of the same rubber material or flexible resin material as the boot 51.

以上、本発明に係る等速自在継手の一実施形態につき説明したが、本発明は上記実施形態に限定されることなく種々の変形が可能である。例えば、本発明は、上記実施形態のクロスグルーブ型等速自在継手のみならず、他の摺動式等速自在継手や固定式等速自在継手にも適用可能である。他の摺動式等速自在継手としてはトリポード型等速自在継手がある。トリポード型等速自在継手の場合、外側継手部材は、軸方向に延びる三つのトラック溝を有する。また、内側継手部材として半径方向に三本の脚軸を突出させたトリポード部材が使用され、転動体としてトリポード部材の脚軸に回転自在に外嵌させるローラが使用される。ローラは、トリポード部材に脚軸に外嵌させた状態で外側継手部材のトラック溝に転動自在に挿入される。   As mentioned above, although one embodiment of the constant velocity universal joint according to the present invention has been described, the present invention is not limited to the above embodiment, and various modifications are possible. For example, the present invention can be applied not only to the cross-groove type constant velocity universal joint of the above embodiment, but also to other sliding type constant velocity universal joints and fixed type constant velocity universal joints. Another sliding constant velocity universal joint is a tripod type constant velocity universal joint. In the case of the tripod type constant velocity universal joint, the outer joint member has three track grooves extending in the axial direction. Further, a tripod member having three leg shafts protruding in the radial direction is used as the inner joint member, and a roller that is rotatably fitted around the leg shaft of the tripod member is used as a rolling element. The roller is rotatably inserted into the track groove of the outer joint member in a state where the roller is externally fitted to the tripod member.

また、上記実施形態では、断面湾曲形状のブーツ５１を使用しているが、本発明は、従来例に示した蛇腹形状のブーツ５１を使用した等速自在継手にも適用可能である。   In the above embodiment, the boot 51 having a curved cross section is used. However, the present invention is also applicable to a constant velocity universal joint using the bellows-shaped boot 51 shown in the conventional example.

また、上記実施形態では、外側継手部材１０の軽量化を図るために、外側継手部材１０の軸方向長さを短尺にして、外側継手部材１０の軸方向内側端部から挿入した内側継手部材２０の先端が外側継手部材１０の軸方向外側端部から若干突出している。このため、外側継手部材１０の外側端部にシール構体６４を有するカップ状のエンドキャップ６０を取付けてある。特許文献２に開示された等速自在継手のように、外側継手部材１０がカップ状に形成され、カップ状外面からステムシャフト２３とほぼ同径の軸部を延在させてあるものであって、軸部が中空状に形成され、軸部の内部とカップ状内面とが連通しているものの場合は、中空円盤状に形成したエンドキャップを軸部の内径側に嵌着するなどして、シール構体６４を外側継手部材１０の内部に設けることも可能である。すなわち、シール構体６４の配設箇所は、外側継手部材１０の外側端部に限定されず、外側継手部材１０の内部に配設された内側継手部材２０よりも軸方向外側であればよい。   Moreover, in the said embodiment, in order to reduce the weight of the outer joint member 10, the inner joint member 20 inserted from the axial direction inner side edge part of the outer joint member 10 by making the axial direction length of the outer joint member 10 short. Is slightly protruding from the outer end of the outer joint member 10 in the axial direction. For this reason, a cup-shaped end cap 60 having a seal structure 64 is attached to the outer end portion of the outer joint member 10. Like the constant velocity universal joint disclosed in Patent Document 2, the outer joint member 10 is formed in a cup shape, and a shaft portion having substantially the same diameter as the stem shaft 23 is extended from the cup-shaped outer surface. In the case where the shaft portion is formed in a hollow shape and the inside of the shaft portion and the cup-shaped inner surface communicate with each other, the end cap formed in a hollow disk shape is fitted on the inner diameter side of the shaft portion, etc. It is also possible to provide the seal structure 64 inside the outer joint member 10. That is, the arrangement location of the seal structure 64 is not limited to the outer end portion of the outer joint member 10, and may be any outside in the axial direction from the inner joint member 20 arranged inside the outer joint member 10.

また、上記実施形態のシール構体６４は二重壁構造としてあるが、三重以上の多重壁構造とすることも可能である。図２（Ａ）（Ｂ）はいずれも、上記実施形態とほぼ同じ構成のエンドキャップ６０に対して第３の壁部６４ｃを固着してなる三重構造のシール構体６４を示している。同図（Ａ）のシール構体６４は、第２の壁部６４ｂより大径の円板状に形成された第３の壁部６４ｃを、カップ部６１の内面側であって第２の壁部６４ｂよりも内側に固着してある。同図（Ｂ）のシール構体６４は、外側継手部材１０の軸方向外側に凸のカップ状に形成された第３の壁部６４ｃを、カップ部６１の外面側に固着し、第１の壁部６４ａの外側に配置してある。このように、エンドキャップ６０には、内面側にも外面側にも壁部を増設することができ、四重以上の多重壁構造についても容易に変形できる。なお、各壁部６４ａ，６４ｂ，６４ｃの通気孔６４ａ１，６４ｂ１，６４ｃ１は、互いに回転中心Ｏ回りの角度を１２０度ずつずらしてあり、図２（Ａ）（Ｂ）では、エンドキャップ６０の断面に各通気孔６４ａ１，６４ｂ１，６４ｃ１を投影した状態を示している。   In addition, the seal structure 64 of the above embodiment has a double wall structure, but it can also have a multiple wall structure of triple or more. 2A and 2B show a triple-structured seal structure 64 in which a third wall portion 64c is fixed to an end cap 60 having substantially the same configuration as that of the above embodiment. In the seal structure 64 of FIG. 6A, a third wall portion 64c formed in a disk shape having a diameter larger than that of the second wall portion 64b is formed on the inner surface side of the cup portion 61 and the second wall portion. It is fixed inside 64b. In the seal structure 64 in FIG. 5B, a third wall portion 64c formed in a cup shape protruding outward in the axial direction of the outer joint member 10 is fixed to the outer surface side of the cup portion 61, and the first wall is fixed. It arrange | positions on the outer side of the part 64a. As described above, the end cap 60 can be provided with a wall portion on both the inner surface side and the outer surface side, and a multiple wall structure having four or more layers can be easily deformed. The vent holes 64a1, 64b1, 64c1 of the walls 64a, 64b, 64c are shifted from each other by 120 degrees around the rotation center O. In FIGS. 2A and 2B, the cross section of the end cap 60 is shown. The state which projected each ventilation hole 64a1, 64b1, 64c1 is shown.

また、上記実施形態では、第１の壁部６４ａ及び第２の壁部６４ｂの回転中心Ｏ回りの角度が１８０度ずれた位置にそれぞれ通気孔６４ａ１，６４ｂ１を設けてあるが、図３のように、回転中心Ｏからの距離が相違する位置に通気孔６４ａ１，６４ｂ１を設けてもよい。この場合、図３のように、各通気孔６４ａ１，６４ｂ１の回転中心Ｏ回りの角度が同じであっても、気体の流動経路Ａを入り組ませることができる。   In the above embodiment, the vent holes 64a1 and 64b1 are provided at positions where the angles around the rotation center O of the first wall portion 64a and the second wall portion 64b are shifted by 180 degrees, as shown in FIG. In addition, the vent holes 64a1 and 64b1 may be provided at positions where the distance from the rotation center O is different. In this case, as shown in FIG. 3, even if the angles around the rotation center O of each of the vent holes 64a1 and 64b1 are the same, the gas flow path A can be complicated.

なお、シール構体６４が三重以上の多重壁構造の場合、各壁部６４ａ，６４ｂ，…の通気孔６４ａ１，６４ｂ１，…のうち少なくともひとつの通気孔の回転中心Ｏ回りの角度及び／又は回転中心Ｏからの距離が他の通気孔と相違していればよいが、気体の流動経路Ａをより複雑に入り組ませるために、隣合う壁部どうしで回転中心Ｏ回りの角度及び／又は回転中心Ｏからの距離を相違させておくことが好ましい。   When the seal structure 64 has a triple or more multi-wall structure, the angle around the rotation center O and / or the rotation center of at least one of the vent holes 64a1, 64b1,. The distance from O may be different from that of other vent holes, but in order to make the gas flow path A more complicated, the angle around the rotation center O and / or the rotation center between adjacent wall portions It is preferable to keep the distance from O different.

また、上記実施形態では、エンドキャップ６０に第２の壁部６４ｂを固着してシール構体６４を構成してあるが、図４のように、複数のエンドキャップ６０ａ，６０ｂを重ね合わせてシール構体６４を構成することも可能である。同図の各エンドキャップ６０ａ，６０ｂは、互いに曲率半径の相違するカップ部６１ａ，６１ｂを有する。外側のエンドキャップ６０ａは、図５に示す従来例のエンドキャップ６０と同様、カップ部６１ａの周縁部に、外側継手部材１０に嵌合させる環状フランジ６２ａを設けてある。内側のエンドキャップ６０ｂは、外側継手部材１０と外側のエンドキャップ６０ａの環状フランジ６２ａとの間に介在させるフランジ部６２ｂをカップ部６１ｂの周縁部から半径方向外側に向けて設けてある。各エンドキャップ６０ａ，６０ｂのカップ部６１ａ，６１ｂは、シール構体６４を構成する壁部となり、回転中心Ｏ回りの角度及び回転中心Ｏからの距離が相違する位置にそれぞれ通気孔６４ａ１，６４ｂ１を設けてある。   In the above embodiment, the second wall portion 64b is fixed to the end cap 60 to form the seal structure 64. However, as shown in FIG. 4, a plurality of end caps 60a and 60b are overlapped to form a seal structure. 64 can be configured. The end caps 60a and 60b in the figure have cup portions 61a and 61b having different curvature radii. The outer end cap 60a is provided with an annular flange 62a to be fitted to the outer joint member 10 at the peripheral edge of the cup portion 61a, similarly to the conventional end cap 60 shown in FIG. The inner end cap 60b is provided with a flange portion 62b interposed between the outer joint member 10 and the annular flange 62a of the outer end cap 60a from the peripheral edge portion of the cup portion 61b toward the radially outer side. The cup portions 61a and 61b of the end caps 60a and 60b become wall portions constituting the seal structure 64, and vent holes 64a1 and 64b1 are provided at positions where the angle around the rotation center O and the distance from the rotation center O are different. It is.

また、上記実施形態では、ブーツ５１の小径端部５１ａにて呼吸作用を行なっていないが、本発明は、図６及び図７に示すようにブーツ５１の小径端部５１ａにて呼吸作用を奏する等速自在継手にも適用可能である。ブーツ５１及びエンドキャップ６０にて呼吸作用を奏すると、継手の通気性が向上するから、ブーツ５１の過大変形を抑制してブーツ５１の長寿命化を図ることができる。また、シール構体６４に通気性を確保すると、リップ部５１ｅの開動作が小さく抑えられる。リップ部５１ｅの開時にリップ部５１ｅの基端部や突起５１ｆの基端部に作用する負荷が低減するので、リップ部５１ｅの耐久性を向上できる。   Moreover, in the said embodiment, although the respiratory action is not performed in the small diameter edge part 51a of the boot 51, this invention has a respiratory action in the small diameter edge part 51a of the boot 51, as shown in FIG.6 and FIG.7. It can also be applied to constant velocity universal joints. If the boot 51 and the end cap 60 perform a breathing action, the air permeability of the joint is improved. Therefore, excessive deformation of the boot 51 can be suppressed and the life of the boot 51 can be extended. Further, if the air permeability is ensured in the seal structure 64, the opening operation of the lip portion 51e can be suppressed small. Since the load acting on the base end portion of the lip portion 51e and the base end portion of the protrusion 51f when the lip portion 51e is opened is reduced, the durability of the lip portion 51e can be improved.

以上のように、本発明は前記実施形態に限定されることなく、特許請求の範囲に記載した発明思想の同一性を維持する範囲内で種々の変形が可能である。   As described above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of maintaining the same inventive concept as defined in the claims.

本発明に係る等速自在継手の一実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Embodiment of the constant velocity universal joint which concerns on this invention. （Ａ）図及び（Ｂ）図はいずれも、上記実施形態の変形例となる三重壁構造のシール構体６４を示す要部拡大断面図で、（Ａ）図はエンドキャップの内面側に２つの壁部を配置したもの、（Ｂ）図はエンドキャップの内面側と外面側にそれぞれ１つずつ壁部を配置したものを示している。Both (A) and (B) are enlarged cross-sectional views of a main part showing a triple-wall structure sealing structure 64 which is a modification of the above embodiment. FIG. (A) shows two parts on the inner surface side of the end cap. FIG. 5B shows the arrangement of the wall portions, and FIG. 5B shows the arrangement of the wall portions one on each of the inner surface side and the outer surface side of the end cap. 各壁部の回転中心からの距離が相違する位置にそれぞれ通気孔を設けたシール構体を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the seal structure which provided the ventilation hole in the position where the distance from the rotation center of each wall part differs. 複数のエンドキャップを重ね合わせてシール構体を構成した変形例を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the modification which piled up the several end cap and comprised the seal structure. 従来の等速自在継手の一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the conventional constant velocity universal joint. 等速自在継手の従来の通気構造の一例を示す要部拡大縦断面図であって、ブーツの小径端部と内側継手部材のスタブシャフトとの嵌合構造を示す図である。It is a principal part expansion longitudinal cross-sectional view which shows an example of the conventional ventilation structure of a constant velocity universal joint, Comprising: It is a figure which shows the fitting structure of the small diameter end part of a boot, and the stub shaft of an inner side coupling member. 図６のＸ−Ｘ線矢視断面図である。FIG. 7 is a cross-sectional view taken along line XX in FIG. 6.

符号の説明Explanation of symbols

１０ 外側継手部材
１１ トラック溝
１２ ボルト孔
２０ 内側継手部材
２１ トラック溝
２２ 内輪
２３ スタブシャフト
２４ 輪溝
２５ サークリップ
３０ ボール
４０ 保持器
４１ ポケット
５０ アダプタ付きブーツ
５１ ブーツ
５１ａ 小径端部
５１ｂ 大径端部
５１ｃ 屈曲部
５１ｄ 通気孔
５１ｅ リップ部
５１ｆ 突起
５２ アダプタ
５２ａ 加締め部
５２ｂ 環状フランジ
５２ｃ ボルト孔
５３ バンド
６０，６０ａ，６０ｂ エンドキャップ
６１，６１ａ，６１ｂ カップ部
６２，６２ａ 環状フランジ
６２ｂ フランジ部
６３ ボルト孔
６４ シール構体
６４ａ 第１の壁部
６４ｂ 第２の壁部
６４ｃ 第３の壁部
６４ａ１，６４ｂ１，６４ｃ１ 通気孔
７０ スタブシャフト
７１ ボルト
７２ 螺子孔
Ａ 気体の流動経路
Ｏ 回転中心 10 outer joint member 11 track groove 12 bolt hole 20 inner joint member 21 track groove 22 inner ring 23 stub shaft 24 ring groove 25 circlip 30 ball 40 cage 41 pocket 50 boot with adapter 51 boot 51a small diameter end 51b large diameter end 51c Bent part 51d Vent hole 51e Lip part 51f Protrusion 52 Adapter 52a Clamping part 52b Annular flange 52c Bolt hole 53 Band 60, 60a, 60b End cap 61, 61a, 61b Cup part 62, 62a Annular flange 62b Flange part 63 Bolt hole 64 Seal structure 64a 1st wall part 64b 2nd wall part 64c 3rd wall part 64a1, 64b1, 64c1 Vent hole 70 Stub shaft 71 Bolt 72 Screw hole A Gas flow path O Rotation center

Claims (4)

軸方向両端が開口した外側継手部材と、外側継手部材に対して相対的に揺動自在に配設された内側継手部材と、外側継手部材と内側継手部材との間にあって内側継手部材の揺動を許容しつつ外側継手部材及び内側継手部材間のトルク伝達を行なう複数の転動体と、内側継手部材に対してトルク伝達可能に結合され、外側継手部材の軸方向内側端部から外部へ延在させたシャフトと、外側継手部材の軸方向内側端部とシャフトに装着され、外側継手部材の軸方向内端側を閉塞するブーツと、外側継手部材の軸方向外端側に設けたシール構体とを備えた等速自在継手において、
シール構体が外側継手部材の軸方向に所定間隔で配設される複数の壁部を有し、各壁部に通気孔を形成すると共に少なくともひとつの壁部の通気孔を他の壁部の通気孔と相違する位置に形成したことを特徴とする等速自在継手。 An outer joint member having both ends opened in the axial direction, an inner joint member disposed so as to be swingable relative to the outer joint member, and the inner joint member swinging between the outer joint member and the inner joint member. Are coupled to a plurality of rolling elements that transmit torque between the outer joint member and the inner joint member while allowing torque to be transmitted to the inner joint member, and extend from the axially inner end of the outer joint member to the outside. A shaft mounted on the axially inner end of the outer joint member and the shaft and closing the axially inner end side of the outer joint member; and a seal structure provided on the outer axial side of the outer joint member; In constant velocity universal joints with
The seal structure has a plurality of wall portions arranged at predetermined intervals in the axial direction of the outer joint member, and at least one wall portion has a vent hole formed in each wall portion. A constant velocity universal joint formed at a position different from a pore. 少なくともひとつの壁部の通気孔を外側継手部材の回転中心から偏心させた位置に形成したことを特徴とする請求項１に記載の等速自在継手。   The constant velocity universal joint according to claim 1, wherein the vent hole of at least one wall portion is formed at a position eccentric from the rotation center of the outer joint member. 二以上の壁部が外側継手部材の回転中心から偏心させた位置に通気孔を有し、該二以上の壁部のうち少なくともひとつの壁部の通気孔を他の壁部の通気孔と外側継手部材の回転中心回りの角度が相違する位置に形成したことを特徴とする請求項２に記載の等速自在継手。   The two or more wall portions have a vent hole at a position eccentric from the rotation center of the outer joint member, and at least one of the two or more wall portions has a vent hole on the outside with the vent hole of the other wall portion. The constant velocity universal joint according to claim 2, wherein the joint member is formed at a position where the angles around the rotation center of the joint member are different. 二以上の壁部が外側継手部材の回転中心から偏心させた位置に通気孔を有し、該二以上の壁部のうち少なくともひとつの壁部の通気孔を他の壁部の通気孔と外側継手部材の回転中心からの距離が相違する位置に形成したことを特徴とする請求項２に記載の等速自在継手。   The two or more wall portions have a vent hole at a position eccentric from the rotation center of the outer joint member, and at least one of the two or more wall portions has a vent hole on the outside with the vent hole of the other wall portion. The constant velocity universal joint according to claim 2, wherein the constant velocity universal joint is formed at a position where the distance from the rotation center of the joint member is different.

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